mk1 gx

Hi,I am asking for your help once again.I have a 1.5 GX,which the engine was removed,& a 1.6 mk2 gtd was fitted.The diesel,has lost compression badly,and once stripped,it has been declared as scrap.The cost of a refurb,is very prohibitive,so I am going to put a petrol back in.A friend of mine has got a mk3 1.8 ADZ & box sitting about doing nothing,with fairly low mileage.This is a carb engine which is ideal.I am wondering if it will fit on to the mk1 mounts,without  modification,seeing it is a big block, as is the original 1.5.Any help will be much appreciated.Thanks.

I thinks it just the 1.3 and 1.1 car which have different engine mounts so you should be fine fitting a 1.8 into a 1.5 but not sure what mounts are fitted to a mk3 golf and not sure on the gearbox, you may need to use the mounts from the old engine.

ADZ - is this a fuel injection engine? The mounts aren't a massive issue but you might need some cutting of the cam belt cover to get the Mk1 engine mount bolted onto the block. However you'll need to either transfer the entire fuel injection over, or convert the car to using a carb (might need an inlet manifold fabricated?)

Also you'd need to consider ignition system - does the ADZ have a dizzy, and does it have mech advance (some don't and its done by the ECU).

I am thinking, basically the ADZ is a 1.8 litre similar to the 2 litre 2E.

Also you'll need to remove the power steering pump and sort out alternate drivebelt arrangements, along with a few other mods.

TravisPrice2 said

a mk3 1.8 ADZ & box sitting about doing nothing,with fairly low mileage.This is a carb engine which is ideal.

I'm no where near 100% sure but had a Google around and I think this is/was a Digifant single point injection engine - its from 1994-1997 so its about the right era for EFI. I wonder if its been converted from carb to EFI? Hopefully rubjonny will see this thread and has more knowledge of the various VW engines, so he can clarify it.

Even so, I don't see it as a major stumbling block. You could probably find a carb inlet manifold that will fit the engine and put a Weber on it with no issues; or reuse the Digifant if you had the ECU and its wiring. Or even some other standalone management, but I suspect that would cost a bit more.

yes the ADZ is running the SPI system so not a carb, although its not really that far off it

its basically the same as a 1.8 carb engine and will drop in using all the mounts you have. you may hafve to chop the timing belt covers, or you may find they will fit roudn the mount just fine. if they dont fit older mk1/2 cover set will bolt on and clear if you prefer.

main issued you face running this engine on a carb is you cant bolt a fuel pump to it, as there is a block breather in the way. so you'll have to wire up an electric pump instead, fair few ways to do it just ensure its running a proper relay setup so it will cut out if you crash.

you need a mk1/2 1.6-1.8 inlet and airbox setup, ideally a 1.8 carb or if you get a weber its easy to rejet. the inlet will have the coolant channel in it required to run a 2e2 carb though if you like them

dizzy will need swapping for a vacuum advance type, if you can get one the kjet gti dizzy will give a nice increase in power. as will a gti cam, needs to be hydro type to match the adz head

wiring wise the diesel loom can be converted, main thing is move the rev counter wire to the coil -ve rather than from the alternator, plus you'll need to run an ignition live for the coil and another for the carb heater.

if you go 2e2 you need a couple other ignition feeds for the 2 electric valves on the back of the carb, plus some wiring for the inlet and autochoke heater thermoswitches. so for an easy life get a mk1 1.6/1.8 carb engine loom in this case.

exhaust wise try to get the later gti 4-2-1 system with the 6 nuts Holden them together, flows a bit nicer than the older toilet bowl carby stuff. bolt a gti system on, and you're done!

rubjonny said

yes the ADZ is running the SPI system so not a carb, although its not really that far off it its basically the same as a 1.8 carb engine and will drop in using all the mounts you have. you may hafve to chop the timing belt covers, or you may find they will fit roudn the mount just fine. if they dont fit older mk1/2 cover set will bolt on and clear if you prefer.

main issued you face running this engine on a carb is you cant bolt a fuel pump to it, as there is a block breather in the way. so you'll have to wire up an electric pump instead, fair few ways to do it just ensure its running a proper relay setup so it will cut out if you crash.

you need a mk1/2 1.6-1.8 inlet and airbox setup, ideally a 1.8 carb or if you get a weber its easy to rejet. the inlet will have the coolant channel in it required to run a 2e2 carb though if you like them dizzy will need swapping for a vacuum advance type, if you can get one the kjet gti dizzy will give a nice increase in power. as will a gti cam, needs to be hydro type to match the adz head wiring wise the diesel loom can be converted, main thing is move the rev counter wire to the coil -ve rather than from the alternator, plus you'll need to run an ignition live for the coil and another for the carb heater.

if you go 2e2 you need a couple other ignition feeds for the 2 electric valves on the back of the carb, plus some wiring for the inlet and autochoke heater thermoswitches. so for an easy life get a mk1 1.6/1.8 carb engine loom in this case.

exhaust wise try to get the later gti 4-2-1 system with the 6 nuts Holden them together, flows a bit nicer than the older toilet bowl carby stuff. bolt a gti system on, and you're done!

I know TravisPrice2 already has the engine, so is (probably more than) half way there with the required parts etc. But on a more general level is the ADZ engine (1.8, 90bhp) any cheaper to use in a conversion than the 2E (2.0, 115bhp)?

if you wanted to run the 2e engine on a mk1/2 carb then you need to do everything I said above, plus you need to change the head for a mk1/2 1.6-1.8 8v unit as the 2.0 inlet manifold fitment differs.

in addition to the dizzy advice you also need to fit a tsr or similar dizzy adaptor ring as the hole is bigger, and swap the 2.0 dizzy gear to the mk1/2 dizzy as thats bigger too

the adz would work out a bit cheaper generally as the head doesnt need swapping, plus no-one really wants them so you struggle to give them away but 2.0 lumps can be had cheap if you shop around, and if you have all the parts in stock already the additional cost isnt so high to convert it to fit